The city image is an important manifestation of the city's strength. In the past, cities used to create and disseminate the city image through TV, radio and other media to release city propaganda films and advertisements. Nowadays, with the popularity of the Internet, traditional media has gradually been neglected by people. Most people prefer to obtain information through the network platform for entertainment and communication. The short video, which is rich in content, interactive and close to people's lives, has quickly attracted a large number of viewers. In this case, cities should also enter the short video platform, which brings new opportunities to the city image communication, and plays an effective role in driving urban tourism and promoting overseas communication. This paper will take Tiktok APP as an example to explore the effective application of short video in promoting the spread of city image.